Zirconia bridge clinical retention/survival rate, that is the presence of the zirconia bridge in patients' mouth in review appointment and will be calculated as a percentage of the total bridges placed as well as presented in Kaplan Meier survival curve.

To accelerate research into rare disorders by connecting individuals who are interested in research and who have been diagnosed with a rare disorder (or a disorder of unknown prevalence, or who are undiagnosed) with researchers who study rare diseases.